露天矿生态恢复后的碳封存能力:江苏省句容市长江流域案例研究

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Shenli Zhou, Xiaokai Li, Pengcheng Zhang, Gang Lu, Xiaolong Zhang, Huaqing Zhang, Faming Zhang
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引用次数: 0

摘要

露天开采严重破坏了原有植被群落和土层,扰乱了植被和土壤的碳循环,造成矿区生态系统不稳定,矿区固碳能力下降。随着环保意识的深入和相关政策的影响,露天矿的生态修复得到了推动。由于矿山分布分散,单个矿山规模较小,矿山生态系统各具特色。然而,生态修复后矿山的固碳能力尚未得到明确评价。因此,本研究以江苏省句容市长江流域矿山为研究对象,对修复后矿山的固碳能力进行了评价。首先,通过实地调查确定了现状植被和土壤的直观效果,选择了植被和土壤的取样和数据采集方法,明确了植被碳含量和土壤有机碳等具体的实验室测试方法。同时,利用层次分析法(AHP)和模糊综合评价法(FCE)建立了由三个方面和九个评价指标组成的评价体系。评价过程包括:建立判断矩阵、计算指标权重、确定成员函数、建立模糊成员矩阵。最后,根据提出的各项指标评价标准,结合实地调查和实验室测试数据,确定了修复矿山的 "优、良、一般、差 "等级分类评价结果。结果表明:(1)矿区固碳能力评价结果为优、良,比例分别为 62.5%和 37.5%,与实地调查结果一致,表明所有修复矿区的固碳能力都得到了有效提高;(2)标准层权重排序为系统稳定性>植被>土壤,最大值为 0.547,表明系统稳定性是影响矿山固碳能力、植被群落可持续性和坡面土壤固定稳定性的主要因素。所提出的评价体系根据直观效果和实验室测试结果,有效评价了恢复采矿系统的短期固碳能力,通过定性评估和定量分析客观反映了固碳能力。该评价方法对恢复采矿具有较强的适用性和可靠性,可为类似的生态恢复工程提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Carbon Sequestration Capacity after Ecological Restoration of Open-Pit Mines: A Case Study in Yangtze River Basin, Jurong City, Jiangsu Province
Open-pit mining seriously damages the original vegetation community and soil layer and disturbs the carbon cycle of vegetation and soil, causing instability in the mining ecosystem and decrease in the carbon sequestration capacity of the mining area. With the deepening of environmental awareness and the influence of related policies, the ecological restoration of open-pit mines has been promoted. The mining ecosystem is distinct owing to the disperse distribution of mines and small scale of single mines. However, the carbon sequestration capability of mines after ecological restoration has not been clearly evaluated. Therefore, this study evaluated the carbon sequestration capacity of restoration mines, taking the mines of the Yangtze River Basin in Jurong City, Jiangsu Province as the research objects. Firstly, the visual effects of the vegetation and soil in their current status were determined through field investigation, the methods for sampling and data collection for the vegetation and soil were selected, and the specific laboratory tests such as the vegetation carbon content and soil organic carbon were clarified. Meanwhile, the evaluation system consisting of three aspects and nine evaluation indexes was established by using the analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE). The process of evaluation included the following: the establishment of the judgment matrix, calculation of the index weight, determination of the membership function, and establishment of the fuzzy membership matrix. Finally, the evaluation results of the restoration mines were determined with the ‘excellent, good, normal and poor’ grade classification according to the evaluation standards for each index proposed considering the data of the field investigation and laboratory tests. The results indicated that (1) the evaluation results of the mines’ carbon sequestration capacity were of excellent and good grade at a proportion of 62.5% and 37.5%, which was in line with the field investigation results and demonstrated the carbon sequestration capacity of all the restored mines was effectively improved; and (2) the weights of the criterion layer were ranked as system stability > vegetation > soil with the largest value of 0.547, indicating the stability of the system is the main factor in the carbon sequestration capacity of the mines and the sustainability of the vegetation community and the stability of soil fixation on the slope. The proposed evaluation system effectively evaluates the short-term carbon sequestration capability of the restoration mining system according to the visual effects and the laboratory testing results, objectively reflecting the carbon sequestration capacity via qualitative assessment and quantitative analysis. The evaluation method is relatively applicable and reliable for restoration mines and can provide a reference for similar ecological restoration engineering.
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CiteScore
7.20
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